From 3cd8519248e9e17d982c6fab0f1a89bca6feb49a Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 16 Jun 2010 00:09:35 +0000 Subject: [PATCH] powerpc: Fix logic error in fixup_irqs When SPARSE_IRQ is set, irq_to_desc() can return NULL. While the code here has a check for NULL, it's not really correct. Fix it by separating the check for it. This fixes CPU hot unplug for me. Reported-by: Alastair Bridgewater Cc: stable@kernel.org [2.6.32+] Signed-off-by: Johannes Berg Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/irq.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index 3333bbdd23e..77be3d058a6 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -295,7 +295,10 @@ void fixup_irqs(const struct cpumask *map) for_each_irq(irq) { desc = irq_to_desc(irq); - if (desc && desc->status & IRQ_PER_CPU) + if (!desc) + continue; + + if (desc->status & IRQ_PER_CPU) continue; cpumask_and(mask, desc->affinity, map); -- 2.20.1